Mathy Asks:

In huge calculations it’s often very helpful as reader to have nice remarks about which manipulation was made. Also, other remarks in equations can help alot, e.g., this one

*Remarks in equations with arrows*In huge calculations it’s often very helpful as reader to have nice remarks about which manipulation was made. Also, other remarks in equations can help alot, e.g., this one

which I like more than the ^-convention. I am generating the above with the following code

Code:

`vertarrowbox{e_j}{$i$textsuperscript{th} spot}`

where

Code:

```
newcommandvertarrowbox[3][2ex]{%
begin{array}[t]{@{}c@{}} #2 \[-0.7ex]
leftuparrowvcenter{hrule height #1}right.kern-nulldelimiterspace\[-1.2ex]
makebox[0pt]{scriptsize#3}
end{array}%
}
```

My goal now is to achieve something similar. I am looking for something like this

to denote that the exchange of the two variables gives a minus sign.

I wonder how I could implement this. I am not sure if tikz-cd is the way to go (I don’t have experience with tikz-cd in equations like this and don’t know if it is even possible to use it this way).

Thank you for your ideas!

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